Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $23.78 +0.56 (+2.41%) Closing price 10/17/2025 04:00 PM EasternExtended Trading$23.78 +0.00 (+0.02%) As of 10/17/2025 07:39 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals Stock Price Performance The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 53.23%, with a year-to-date return of -35.95%. In the past month, the stock has decreased 13.34%, reflecting recent market activity. As of the latest close, Amphastar Pharmaceuticals traded at $23.78 with a market cap of $1.11 billion and volume of 321,483 shares. Five years ago, the stock traded at $20.96, representing a 13.45% increase over that period. At the time, it had a market cap of $995.31 million and a volume of 125,427 shares. Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy. 5 Day Performance+1.15%1 Month Performance-13.34%3 Month Performance+15.32%Year-To-Date Performance-35.95%1 Year Performance-53.23%5 Year Performance+13.45% AMPH Stock Chart for Saturday, October, 18, 2025 AMPH Chart by TradingView Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization10/17/2025$23.22$23.78+2.41%$23.89$23.09321,483 shs$1.11 billion10/16/2025$23.14$23.22+0.35%$23.61$22.94449,608 shs$1.08 billion10/15/2025$23.86$23.14-3.02%$24.20$22.94504,306 shs$1.08 billion10/14/2025$23.51$23.86+1.49%$23.98$23.33282,165 shs$1.11 billion10/13/2025$23.63$23.51-0.51%$24.21$23.42324,135 shs$1.09 billion10/10/2025$24.97$23.63-5.37%$25.02$23.20607,448 shs$1.10 billion10/09/2025$25.98$24.97-3.89%$26.11$24.68441,557 shs$1.16 billion10/08/2025$25.83$25.98+0.58%$26.32$25.57250,038 shs$1.21 billion10/07/2025$26.58$25.83-2.82%$26.68$25.80390,489 shs$1.20 billion10/06/2025$26.75$26.58-0.64%$27.07$26.53241,845 shs$1.24 billion Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 10/03/2025$26.52$26.75+0.87%$27.31$26.46331,099 shs$1.24 billion10/02/2025$26.99$26.52-1.74%$27.03$26.46288,366 shs$1.23 billion10/01/2025$26.65$26.99+1.28%$27.39$26.74337,093 shs$1.25 billion09/30/2025$26.92$26.65-1.00%$27.27$26.47392,172 shs$1.24 billion09/29/2025$26.85$26.92+0.26%$27.21$26.35513,361 shs$1.25 billion09/26/2025$26.36$26.85+1.86%$26.92$26.34291,264 shs$1.25 billion09/25/2025$26.87$26.36-1.90%$26.89$25.95565,979 shs$1.23 billion09/24/2025$27.41$26.87-1.97%$27.62$26.78302,731 shs$1.25 billion09/23/2025$27.89$27.41-1.72%$28.22$27.21323,932 shs$1.27 billion09/22/2025$27.64$27.89+0.90%$28.24$27.61424,676 shs$1.30 billion09/19/2025$27.44$27.64+0.73%$27.77$26.871.38 million shs$1.28 billion09/18/2025$26.98$27.44+1.70%$27.70$26.90458,903 shs$1.28 billion09/17/2025$27.00$26.98-0.07%$27.90$26.57920,909 shs$1.25 billion Related Companies ACLX Stock Chart KYMR Stock Chart PTGX Stock Chart CRNX Stock Chart ZLAB Stock Chart AKRO Stock Chart ACAD Stock Chart AAPG Stock Chart MIRM Stock Chart LNTH Stock Chart Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. This page (NASDAQ:AMPH) was last updated on 10/18/2025 by MarketBeat.com Staff From Our PartnersREVEALED: Something Big Happening Behind White House DoorsWhat I just learned about what’s unfolding in the White House is truly stunning… And you need to see it for...Paradigm Press | SponsoredThis dark force is about to change everythingSomething unusual is unfolding inside the Republican Party — from Marjorie Taylor Greene breaking ranks to Ted...Porter & Company | SponsoredElon’s Optimus to mint new “Musk Millionaires” as soon as Oct 23???Elon Musk may be set to create more "Musk Millionaires" as soon as October 23rd… Because on that day, he's exp...InvestorPlace | SponsoredMove $1,000 into this stock before Nov 6The End of Tesla? "Hold onto your Tesla stock." That's the message insiders at Tesla have been giving staff...Altimetry | SponsoredINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | Sponsored“Fed Proof” Your Bank Account with THESE 4 Simple StepsStarting as soon as a few months from now, the United States government will make a sweeping change to bank ac...Weiss Ratings | SponsoredNext opportunity for crypto millionsThe floodgates have opened. Bitcoin and Ethereum ETFs are seeing record-breaking inflows, the biggest since...Crypto 101 Media | SponsoredIf You Keep Cash In A U.S. Bank Account… Read This NOWThe Treasury Department just issued a stunning warning: U.S. banks could lose up to $6.6 trillion of custom...Banyan Hill Publishing | Sponsored Adding Choose a watchlist: Watchlist Adding You have already added ten stocks to your watchlist. Upgrade to MarketBeat All Access to add more stocks to your watchlist. Adding Amphastar Pharmaceuticals, Inc. Please log in to your account or sign up in order to add this asset to your watchlist. Share Amphastar Pharmaceuticals With A Colleague Link copied to clipboard. Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. Real-time analyst ratings, insider transactions, earnings data, and more. Our daily ratings and market update email newsletter. Sign in to your free account to enjoy all that MarketBeat has to offer. Sign In Create Account Your Email Address: Email Address Required Your Password: Password Required Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Please enter your email address. Please enter a valid email address Choose a Password: Please enter your password. Your password must be at least 8 characters long and contain at least 1 number, 1 letter, and 1 special character. Create My Account (Free) or Sign in with Facebook Sign in with Google By creating a free account, you agree to our terms of service. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Free AMPH Stock Alerts